Jaw for face-plates or chucks for turning-lathes.



No. 630,202. Patented Aug. I, 1899.

E. EKERDT.

JAW FOB FACE PLATES 0R CHUCKS FOR TURNING LATHES.

' Application 1 J1 5 1898.

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No. 630,202. Patented Aug. I, I899. E. EKERDT.

JAW FOB FACE PLATESOR CHUGKS FOR TURNING LATHES.

(Application filed July 5, 18984) (No Model.) 2 Sheets-Sheet 2.

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m: Nonms PETERS co. wore-nun" WASNINOYON. n. c.

UNrrnn STATES PATENT OFFICE.

EDUARD EKERDT, OF BIBERACl-I, GERMANY.

JAW FOR FACE-PLATES OR CHUCKS FORTURNING LATHES.

SPECIFICATION forming part of Letters Patent No. 680,202, dated August 1, 1899.

Application filed July 5, 1898- To all whom it may concern.-

Be it known that I, EDUARD EKERDT, a subject of the King of \Viirtemberg, residing at' Biberach, in the Kingdom of \Viirtemberg, Germany, have invented certain new and usef ul Improvements in Jaws for the Face-Plates or Chucks for Turning-Lathes, (for which I have applied for patents in Germany, dated April 25, 1898; in Austria, dated May 19, 1898; in Hungary, dated May 20, 1898, No. 7,255; in France, dated May 21, 1898, No. 265,933; in Belgium, dated May 21, 1898, No. 105,976, and in Switzerlanchdat-ed May 21, 1898, No.18,478,) of which the following is a specification.

My invention relates to improvements in jaws for face-plates or chucks of lat-hes; and the object of my invention is to improve the construction and operation of lathe-chucks.-

In order that the said invention may be properly understood, I will first describe the same with reference to the accompanying drawings, which form a part of this specification.

In said drawings, Figure 1 is a side View, partly in section, of an old but somewhat a1- tered face-plate jaw. Fig. 2 is a side view of the improved jaw which forms the subjectmatter of the invention. Fig. 3 is a back view of the chuck-jaw, and Fig. 4 is a front View of the altered old form of jaw shown in Fig. 1. Fig. 5 is a side elevation, partly broken away, showing the parts of the invention assembled.

The new chuckj aw consists of two parts A B. The part A, which is a slightly-altered form of the usual jaw, consists of the short center piece a, which is provided with the face-segments c and secured by means of its integral nut b at the back in the corresponding slot of the face-plate, (not shown,) in which it is guided, as usual. The stud d, with the nut and washer 6, serves to secure the jaw in adjusted position in the usual manner. The screw-spindle f, working in nut Z2, serves in the usual manner to radially move the jaw on the face-plate. In the face of the center piece a is bored a hole h, which is widened out or undercut at i, as shown, so as to form a circular recess, which is rectangular in cross-section. Two channel-grooves o are cut in the wall of hole h,at points diametrically opposite, of the same depth as undercut 't' for the pur- $erial No. 685,173. (No model.)

pose hereinafter explained. The new part B of the jaw, which is provided with working faces a, m, and 7a to secure the work, has at its back a round stud h, which latter is propided at its end with two lugs or projections g, arranged diametrically opposite one another. The part B is further provided with two faces q,which are concentric with the stud h and which when bearing against the inner faces of the segments 0 of the part A serve to support the part B.

The part B is secured to the part A as follows: 'The part B is supported in horizontal position, so that the projections 9 may enter through the grooves 0 into the undercut groove or recess 2', and when this has been done it is turned into the vertical position, so that the faces q will bear against the inner surfaces of the segments 0 and the part B lie parallel to the part A. The whole jaw (A and B) is now ready for use, and a piece of work may be secured by either of the surfaces 75 or m of the face-plate, (the outer surface q of the part B of such jaw bearing against the exterior seg ment 0,) the pressure being put on by the screw f, as usual. The lugs or projections g, owing to the fact that they have been turned through an angle of ninety degrees in the recess 'i, prevent the part B coming apart from A. Should the movable jaw for any wellknown reason require to be turned, all that is necessary is to turn the part B through an angle of one hundred and eighty degrees on its pin it, while the part A is allowed to remain in its proper position on the face-plate.

\Vhat I claim, and desire to secure by Letters Patent, is--- The combination with the jaw A, having face-segments c, c, and hole 71. having undercut recess iand diametrically opposite grooves o, o, of a jaw B, having a plurality of working faces, a central stud h having diametrically-opposed lugs g, g, and faces q concentric with stud h and coacting with segments a, c, substantiallyas and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of two witnesses.

EDUARD EKERDT.

IVitncsses:

WILHELM BnoK,

HERMANN EKERDT. 

